Add Instant Messanger template
Add bluebird - a promise library for js
Add another default user: admins_girlfriend
codestyle: trailing space
Add Post/Thread repos. Rename post/thread tables.

Schema: Post -> post, Thread -> thread
Relate threads to users as many to many
Initial draft of Instant Messanger

This includes:
  Routes and controller actions for creating user to user post,
    displaying im, displaying thread list, displaying thread messages.
  im.js which exploits above functionality via XHR requests.
  twig template for im interface